juko | 1fde00591af468abbe113f3aa5c4ecf0bc80d8864279b9bb76afbd09b5037e0d

General

Target
2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe
Size 49KB
Sample260522-xfla3adv2r
SHA256 1fde00591af468abbe113f3aa5c4ecf0bc80d8864279b9bb76afbd09b5037e0d
MD5 f6d1b546bd5a7b4d529a6c8c51e45284
SHA1 bccb240ca310296610b668c695c07eef68ec2de8
SHA512 136ba30ae7e8db2e55bf0e92142c5aa9a3b65b6520fc0c026720126689c8bdf68a2ac2fcb354dc57ef37adca4b4c5aa33afbf59ce37398c97a2ceab5d24b2c4c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2h:VLy2Kerc64CiGImVucp4kojWh2h
TLSH
T129334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral1/memory/5680-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000700000001e6bc-5.dat	family_juko
behavioral1/memory/5680-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5632-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000900000002434e-15.dat	family_juko
behavioral1/memory/5304-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5304-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5632	WINWORD.exe
5304	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
5708	cmd.exe
5592	PING.EXE
5352	PING.EXE
4224	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5592	PING.EXE
5352	PING.EXE
4224	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5680 wrote to memory of 5632	5680	2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe	89
PID 5632 wrote to memory of 5708	5632	WINWORD.exe	90
PID 5708 wrote to memory of 5592	5708	cmd.exe	92
PID 5708 wrote to memory of 5352	5708	cmd.exe	94
PID 5708 wrote to memory of 4224	5708	cmd.exe	95
PID 5708 wrote to memory of 5304	5708	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5680
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5632
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00003A70" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5708
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5592
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5352
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4224
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:5304

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003A70

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003A70
Size 49KB
SHA256 b27659a900d464d7358de4ea801edf240a3090e137ede46901b2e93001975478
MD5 1ccb73d73fcb6928e3c61af7aa7162ea
SHA1 0b19d2b5dc4bd1228f2af21c7905af38a16901b7
SHA512 45b2b7221434bafdaa0073282f1d18a193b7c1d85d9b45ed573bec4f58e2b4d43387b2d7db01d5e36f29deabe309690238b2f4e08775d891beffcdf897b17bd4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2e:VLy2Kerc64CiGImVucp4kojWh2e
TLSH
T10E334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 1fde00591af468abbe113f3aa5c4ecf0bc80d8864279b9bb76afbd09b5037e0d
MD5 f6d1b546bd5a7b4d529a6c8c51e45284
SHA1 bccb240ca310296610b668c695c07eef68ec2de8
SHA512 136ba30ae7e8db2e55bf0e92142c5aa9a3b65b6520fc0c026720126689c8bdf68a2ac2fcb354dc57ef37adca4b4c5aa33afbf59ce37398c97a2ceab5d24b2c4c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2h:VLy2Kerc64CiGImVucp4kojWh2h
TLSH
T129334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5304-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5304-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5632-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5680-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5680-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads